Make the Big-Batch Grilled Sausages, Peppers & Onions. For this recipe, portion out 3/4 cup chopped peppers and 1/3 cup chopped onions.
Roast seasoned squash, cut side down, on greased baking sheet at 400° for 20 minutes. Spread vegetables on sheet alongside squash. Roast until squash is tender and vegetables are hot, about 10 minutes. In bowl, mix remaining ingredients with spinach, peppers and onions; season. Spoon into squash.